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        <li class="chapter " data-level="0" data-path="index.html">
            
                
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                        自述
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                            <b>1.</b>
                        
                        介绍
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                            <b>1.1.</b>
                        
                        动机
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                            <b>1.2.</b>
                        
                        核心概念
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                            <b>1.3.</b>
                        
                        三大原则
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                            <b>1.4.</b>
                        
                        先前技术
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                            <b>1.5.</b>
                        
                        生态系统
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                            <b>1.6.</b>
                        
                        示例
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                            <b>2.</b>
                        
                        基础
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                            <b>2.1.</b>
                        
                        Action
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                            <b>2.2.</b>
                        
                        Reducer
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                            <b>2.3.</b>
                        
                        Store
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                            <b>2.4.</b>
                        
                        数据流
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                            <b>2.5.</b>
                        
                        搭配 React
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                            <b>2.6.</b>
                        
                        示例：Todo List
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                            <b>3.</b>
                        
                        高级
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                            <b>3.1.</b>
                        
                        异步 Action
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                            <b>3.2.</b>
                        
                        异步数据流
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                            <b>3.3.</b>
                        
                        Middleware
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                            <b>3.4.</b>
                        
                        搭配 React Router
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                            <b>3.5.</b>
                        
                        示例：Reddit API
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                            <b>3.6.</b>
                        
                        下一步
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                            <b>4.</b>
                        
                        技巧
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                            <b>4.1.</b>
                        
                        迁移到 Redux
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        <li class="chapter " data-level="4.2" data-path="docs/recipes/UsingObjectSpreadOperator.html">
            
                
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                            <b>4.2.</b>
                        
                        使用对象展开运算符
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        <li class="chapter " data-level="4.3" data-path="docs/recipes/ReducingBoilerplate.html">
            
                
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                            <b>4.3.</b>
                        
                        减少样板代码
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                            <b>4.4.</b>
                        
                        服务端渲染
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                            <b>4.5.</b>
                        
                        编写测试
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        <li class="chapter " data-level="4.6" data-path="docs/recipes/ComputingDerivedData.html">
            
                
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                            <b>4.6.</b>
                        
                        计算衍生数据
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        <li class="chapter " data-level="4.7" data-path="docs/recipes/ImplementingUndoHistory.html">
            
                
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                            <b>4.7.</b>
                        
                        实现撤销重做
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        <li class="chapter " data-level="4.8" data-path="docs/recipes/IsolatingSubapps.html">
            
                
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                            <b>4.8.</b>
                        
                        子应用隔离
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        <li class="chapter " data-level="4.9" data-path="docs/recipes/StructuringReducers.html">
            
                
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                            <b>4.9.</b>
                        
                        组织 Reducer
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        <li class="chapter " data-level="4.9.1" data-path="docs/recipes/reducers/PrerequisiteConcepts.html">
            
                
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                            <b>4.9.1.</b>
                        
                        Reducer 基础概念
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        <li class="chapter " data-level="4.9.2" data-path="docs/recipes/reducers/BasicReducerStructure.html">
            
                
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                            <b>4.9.2.</b>
                        
                        Reducer 基础结构
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        <li class="chapter " data-level="4.9.3" data-path="docs/recipes/reducers/SplittingReducerLogic.html">
            
                
                    <a href="../../docs/recipes/reducers/SplittingReducerLogic.html">
                
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                            <b>4.9.3.</b>
                        
                        Reducer 逻辑拆分
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        </li>
    
        <li class="chapter " data-level="4.9.4" data-path="docs/recipes/reducers/RefactoringReducersExample.html">
            
                
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                            <b>4.9.4.</b>
                        
                        Reducer 重构示例
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        <li class="chapter " data-level="4.9.5" data-path="docs/recipes/reducers/UsingCombineReducers.html">
            
                
                    <a href="../../docs/recipes/reducers/UsingCombineReducers.html">
                
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                            <b>4.9.5.</b>
                        
                        `combineReducers` 用法
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        <li class="chapter " data-level="4.9.6" data-path="docs/recipes/reducers/BeyondCombineReducers.html">
            
                
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                            <b>4.9.6.</b>
                        
                        `combineReducers` 进阶
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        <li class="chapter " data-level="4.9.7" data-path="docs/recipes/reducers/NormalizingStateShape.html">
            
                
                    <a href="../../docs/recipes/reducers/NormalizingStateShape.html">
                
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                            <b>4.9.7.</b>
                        
                        State 范式化
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="4.9.8" data-path="docs/recipes/reducers/UpdatingNormalizedData.html">
            
                
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                            <b>4.9.8.</b>
                        
                        管理范式化数据
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="4.9.9" data-path="docs/recipes/reducers/ReusingReducerLogic.html">
            
                
                    <a href="../../docs/recipes/reducers/ReusingReducerLogic.html">
                
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                            <b>4.9.9.</b>
                        
                        Reducer 逻辑复用
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="4.9.10" data-path="docs/recipes/reducers/ImmutableUpdatePatterns.html">
            
                
                    <a href="../../docs/recipes/reducers/ImmutableUpdatePatterns.html">
                
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                            <b>4.9.10.</b>
                        
                        不可变更新模式
                    </a>
            
            
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        <li class="chapter " data-level="4.9.11" data-path="docs/recipes/reducers/InitializingState.html">
            
                
                    <a href="../../docs/recipes/reducers/InitializingState.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>4.9.11.</b>
                        
                        初始化 State
                    </a>
            
            
        </li>
    

            </ul>
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="5" data-path="docs/FAQ.html">
            
                
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                            <b>5.</b>
                        
                        常见问题
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            <ul class="articles">
                
    
        <li class="chapter " data-level="5.1" data-path="docs/faq/General.html">
            
                
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                            <b>5.1.</b>
                        
                        综合
                    </a>
            
            
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        <li class="chapter active" data-level="5.2" data-path="docs/faq/Reducers.html">
            
                
                    <a href="../../docs/faq/Reducers.html">
                
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                            <b>5.2.</b>
                        
                        Reducer
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="5.3" data-path="docs/faq/OrganizingState.html">
            
                
                    <a href="../../docs/faq/OrganizingState.html">
                
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                            <b>5.3.</b>
                        
                        组织 State
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="5.4" data-path="docs/faq/StoreSetup.html">
            
                
                    <a href="../../docs/faq/StoreSetup.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>5.4.</b>
                        
                        创建 Store
                    </a>
            
            
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        <li class="chapter " data-level="5.5" data-path="docs/faq/Actions.html">
            
                
                    <a href="../../docs/faq/Actions.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>5.5.</b>
                        
                        Action
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="5.6" data-path="docs/faq/CodeStructure.html">
            
                
                    <a href="../../docs/faq/CodeStructure.html">
                
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                            <b>5.6.</b>
                        
                        代码结构
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="5.7" data-path="docs/faq/Performance.html">
            
                
                    <a href="../../docs/faq/Performance.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>5.7.</b>
                        
                        性能
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        </li>
    
        <li class="chapter " data-level="5.8" data-path="docs/faq/ReactRedux.html">
            
                
                    <a href="../../docs/faq/ReactRedux.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>5.8.</b>
                        
                        React Redux
                    </a>
            
            
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        <li class="chapter " data-level="5.9" data-path="docs/faq/Miscellaneous.html">
            
                
                    <a href="../../docs/faq/Miscellaneous.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>5.9.</b>
                        
                        其它
                    </a>
            
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="6" data-path="docs/Troubleshooting.html">
            
                
                    <a href="../../docs/Troubleshooting.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>6.</b>
                        
                        排错
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="7" data-path="docs/Glossary.html">
            
                
                    <a href="../../docs/Glossary.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>7.</b>
                        
                        词汇表
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="8" data-path="docs/api/index.html">
            
                
                    <a href="../../docs/api/index.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.</b>
                        
                        API 文档
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="8.1" data-path="docs/api/createStore.html">
            
                
                    <a href="../../docs/api/createStore.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.1.</b>
                        
                        createStore
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="8.2" data-path="docs/api/Store.html">
            
                
                    <a href="../../docs/api/Store.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.2.</b>
                        
                        Store
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="8.3" data-path="docs/api/combineReducers.html">
            
                
                    <a href="../../docs/api/combineReducers.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.3.</b>
                        
                        combineReducers
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="8.4" data-path="docs/api/applyMiddleware.html">
            
                
                    <a href="../../docs/api/applyMiddleware.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.4.</b>
                        
                        applyMiddleware
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="8.5" data-path="docs/api/bindActionCreators.html">
            
                
                    <a href="../../docs/api/bindActionCreators.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.5.</b>
                        
                        bindActionCreators
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="8.6" data-path="docs/api/compose.html">
            
                
                    <a href="../../docs/api/compose.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.6.</b>
                        
                        compose
                    </a>
            
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="9" data-path="docs/react-redux/index.html">
            
                
                    <a href="../../docs/react-redux/index.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.</b>
                        
                        react-redux 文档
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="9.1" data-path="docs/react-redux/api.html">
            
                
                    <a href="../../docs/react-redux/api.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.1.</b>
                        
                        API
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="9.2" data-path="docs/react-redux/troubleshooting.html">
            
                
                    <a href="../../docs/react-redux/troubleshooting.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.2.</b>
                        
                        排错
                    </a>
            
            
        </li>
    

            </ul>
            
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                        <a id="edit-link" href="https://github.com/camsong/redux-in-chinese/tree/master/docs/faq/Reducers.md" class="btn fa fa-edit pull-left">&#xA0;&#xA0;&#x5F00;&#x59CB;&#x7EA0;&#x9519;</a><h1 id="redux-%E5%B8%B8%E8%A7%81%E9%97%AE%E9%A2%98%EF%BC%9Areducer">Redux &#x5E38;&#x89C1;&#x95EE;&#x9898;&#xFF1A;Reducer</h1>
<h2 id="%E7%9B%AE%E5%BD%95">&#x76EE;&#x5F55;</h2>
<ul>
<li><a href="#reducers-share-state">&#x5982;&#x4F55;&#x5728; reducer &#x4E4B;&#x95F4;&#x5171;&#x4EAB; state? combineReducers &#x662F;&#x5FC5;&#x987B;&#x7684;&#x5417;&#xFF1F;</a></li>
<li><a href="#reducers-use-switch">&#x5904;&#x7406; action &#x5FC5;&#x987B;&#x7528; switch &#x8BED;&#x53E5;&#x5417;&#xFF1F;</a></li>
</ul>
<h2 id="reducer">Reducer</h2>
<p><a id="reducers-share-state"></a></p>
<h3 id="%E5%A6%82%E4%BD%95%E5%9C%A8-reducer-%E4%B9%8B%E9%97%B4%E5%85%B1%E4%BA%AB-state-combinereducers-%E6%98%AF%E5%BF%85%E9%A1%BB%E7%9A%84%E5%90%97%EF%BC%9F">&#x5982;&#x4F55;&#x5728; reducer &#x4E4B;&#x95F4;&#x5171;&#x4EAB; state? <code>combineReducers</code> &#x662F;&#x5FC5;&#x987B;&#x7684;&#x5417;&#xFF1F;</h3>
<p>Redux store &#x63A8;&#x8350;&#x7684;&#x7ED3;&#x6784;&#x662F;&#x5C06; state &#x5BF9;&#x8C61;&#x6309;&#x952E;&#x503C;&#x5207;&#x5206;&#x6210; &#x201C;&#x5C42;&#x201D;&#xFF08;slice&#xFF09; &#x6216;&#x8005; &#x201C;&#x57DF;&#x201D;&#xFF08;domain&#xFF09;&#xFF0C;&#x5E76;&#x63D0;&#x4F9B;&#x72EC;&#x7ACB;&#x7684; reducer &#x65B9;&#x6CD5;&#x7BA1;&#x7406;&#x5404;&#x81EA;&#x7684;&#x6570;&#x636E;&#x5C42;&#x3002;&#x5C31;&#x50CF; Flux &#x6A21;&#x5F0F;&#x4E2D;&#x7684;&#x591A;&#x4E2A;&#x72EC;&#x7ACB; store &#x4E00;&#x6837;&#xFF0C; Redux &#x4E3A;&#x6B64;&#x8FD8;&#x63D0;&#x4F9B;&#x4E86; <a href="docs/api/combineReducers.md"><code>combineReducers</code></a> &#x5DE5;&#x5177;&#x6765;&#x7B80;&#x5316;&#x8BE5;&#x6A21;&#x578B;&#x3002;&#x5E94;&#x5F53;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C; <code>combineReducers</code> <strong>&#x4E0D;&#x662F;</strong> &#x5FC5;&#x987B;&#x7684;&#xFF0C;&#x5B83;&#x4EC5;&#x4EC5;&#x662F;&#x901A;&#x8FC7;&#x7B80;&#x5355;&#x7684; JavaScript &#x5BF9;&#x8C61;&#x4F5C;&#x4E3A;&#x6570;&#x636E;&#xFF0C;&#x8BA9; state &#x5C42;&#x80FD;&#x4E0E; reducer &#x4E00;&#x4E00;&#x5173;&#x8054;&#x7684;&#x51FD;&#x6570;&#x800C;&#x5DF2;&#x3002;</p>
<p>&#x8BB8;&#x591A;&#x7528;&#x6237;&#x60F3;&#x5728; reducer &#x4E4B;&#x95F4;&#x5171;&#x4EAB;&#x6570;&#x636E;&#xFF0C;&#x4F46;&#x662F; <code>combineReducers</code> &#x4E0D;&#x5141;&#x8BB8;&#x6B64;&#x79CD;&#x884C;&#x4E3A;&#x3002;&#x6709;&#x8BB8;&#x591A;&#x53EF;&#x7528;&#x7684;&#x529E;&#x6CD5;&#xFF1A;</p>
<ul>
<li>&#x5982;&#x679C;&#x4E00;&#x4E2A; reducer &#x60F3;&#x83B7;&#x53D6;&#x5176;&#x5B83; state &#x5C42;&#x7684;&#x6570;&#x636E;&#xFF0C;&#x5F80;&#x5F80;&#x610F;&#x5473;&#x7740; state &#x6811;&#x9700;&#x8981;&#x91CD;&#x6784;&#xFF0C;&#x9700;&#x8981;&#x8BA9;&#x5355;&#x72EC;&#x7684; reducer &#x5904;&#x7406;&#x66F4;&#x591A;&#x7684;&#x6570;&#x636E;&#x3002;</li>
<li>&#x4F60;&#x53EF;&#x80FD;&#x9700;&#x8981;&#x81EA;&#x5B9A;&#x4E49;&#x65B9;&#x6CD5;&#x53BB;&#x5904;&#x7406;&#x8FD9;&#x4E9B; action&#xFF0C;&#x7528;&#x81EA;&#x5B9A;&#x4E49;&#x7684;&#x9876;&#x5C42; reducer &#x65B9;&#x6CD5;&#x66FF;&#x6362; <code>combineReducers</code>&#x3002;&#x4F60;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x7C7B;&#x4F3C;&#x4E8E; <a href="https://github.com/acdlite/reduce-reducers" target="_blank">reduce-reducers</a> &#x7684;&#x5DE5;&#x5177;&#x8FD0;&#x884C; <code>combineReducers</code> &#x53BB;&#x5904;&#x7406;&#x5C3D;&#x53EF;&#x80FD;&#x591A;&#x7684; action&#xFF0C;&#x540C;&#x65F6;&#x8FD8;&#x8981;&#x4E3A;&#x5B58;&#x5728; state &#x4EA4;&#x53C9;&#x90E8;&#x5206;&#x7684;&#x82E5;&#x5E72; action &#x6267;&#x884C;&#x66F4;&#x4E13;&#x7528;&#x7684; reducer&#x3002;</li>
<li>&#x7C7B;&#x4F3C;&#x4E8E; <code>redux<span class="token operator">-</span>thunk</code> &#x7684; <a href="docs/advanced/AsyncActions.md">&#x5F02;&#x6B65; action &#x521B;&#x5EFA;&#x51FD;&#x6570;</a> &#x80FD;&#x901A;&#x8FC7; <code><span class="token function">getState</span><span class="token punctuation">(</span><span class="token punctuation">)</span></code> &#x65B9;&#x6CD5;&#x83B7;&#x53D6;&#x6240;&#x6709;&#x7684; state&#x3002; action &#x521B;&#x5EFA;&#x51FD;&#x6570;&#x80FD;&#x4ECE; state &#x4E2D;&#x68C0;&#x7D22;&#x5230;&#x989D;&#x5916;&#x7684;&#x6570;&#x636E;&#x5E76;&#x4F20;&#x5165; action&#xFF0C;&#x6240;&#x4EE5; reducer &#x6709;&#x8DB3;&#x591F;&#x7684;&#x4FE1;&#x606F;&#x53BB;&#x66F4;&#x65B0;&#x6240;&#x7EF4;&#x62A4;&#x7684; state &#x5C42;&#x3002;</li>
</ul>
<p>&#x53EA;&#x9700;&#x7262;&#x8BB0; reducer &#x4EC5;&#x4EC5;&#x662F;&#x51FD;&#x6570;&#xFF0C;&#x53EF;&#x4EE5;&#x968F;&#x5FC3;&#x6240;&#x6B32;&#x7684;&#x8FDB;&#x884C;&#x5212;&#x5206;&#x548C;&#x7EC4;&#x5408;&#xFF0C;&#x800C;&#x4E14;&#x4E5F;&#x63A8;&#x8350;&#x5C06;&#x5176;&#x5206;&#x89E3;&#x6210;&#x66F4;&#x5C0F;&#x3001;&#x53EF;&#x590D;&#x7528;&#x7684;&#x51FD;&#x6570; (&#x201C;reducer &#x5408;&#x6210;&#x201D;)&#x3002;&#x6309;&#x7167;&#x8FD9;&#x79CD;&#x505A;&#x6CD5;&#xFF0C;&#x5982;&#x679C;&#x5B50; reducer &#x9700;&#x8981;&#x4E00;&#x4E9B;&#x53C2;&#x6570;&#x65F6;&#xFF0C;&#x53EF;&#x4EE5;&#x4ECE;&#x7236; reducer &#x4F20;&#x5165;&#x3002;&#x4F60;&#x53EA;&#x9700;&#x8981;&#x786E;&#x4FDD;&#x4ED6;&#x4EEC;&#x9075;&#x5FAA; reducer &#x7684;&#x57FA;&#x672C;&#x51C6;&#x5219;&#xFF1A; <code><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> newState</code>&#xFF0C;&#x5E76;&#x4E14;&#x4EE5;&#x4E0D;&#x53EF;&#x53D8;&#x7684;&#x65B9;&#x5F0F;&#x66F4;&#x65B0; state&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x76F4;&#x63A5;&#x4FEE;&#x6539; state&#x3002;</p>
<h4 id="%E8%A1%A5%E5%85%85%E8%B5%84%E6%96%99">&#x8865;&#x5145;&#x8D44;&#x6599;</h4>
<p><strong>&#x6587;&#x6863;</strong></p>
<ul>
<li><a href="docs/api/combineReducers.md">API: combineReducers</a></li>
<li><a href="docs/recipes/StructuringReducers.md">Recipes: Reducers &#x57FA;&#x7840;&#x7ED3;&#x6784;</a></li>
</ul>
<p><strong>&#x8BA8;&#x8BBA;</strong></p>
<ul>
<li><a href="https://github.com/reactjs/redux/issues/601" target="_blank">#601: A concern on combineReducers, when an action is related to multiple reducers</a></li>
<li><a href="https://github.com/reactjs/redux/issues/1400" target="_blank">#1400: Is passing top-level state object to branch reducer an anti-pattern&#xFF1F;</a></li>
<li><a href="http://stackoverflow.com/questions/34333979/accessing-other-parts-of-the-state-when-using-combined-reducers" target="_blank">Stack Overflow: Accessing other parts of the state when using combined reducers&#xFF1F;</a></li>
<li><a href="http://stackoverflow.com/questions/34427851/reducing-an-entire-subtree-with-redux-combinereducers" target="_blank">Stack Overflow: Reducing an entire subtree with redux combineReducers</a></li>
<li><a href="https://invalidpatent.wordpress.com/2016/02/18/sharing-state-between-redux-reducers/" target="_blank">Sharing State Between Redux Reducers</a></li>
</ul>
<p><a id="reducers-use-switch"></a></p>
<h3 id="%E5%A4%84%E7%90%86-action-%E5%BF%85%E9%A1%BB%E7%94%A8-switch-%E8%AF%AD%E5%8F%A5%E5%90%97%EF%BC%9F">&#x5904;&#x7406; action &#x5FC5;&#x987B;&#x7528; <code><span class="token keyword">switch</span></code> &#x8BED;&#x53E5;&#x5417;&#xFF1F;</h3>
<p>&#x4E0D;&#x662F;&#x3002;&#x5728; reducer &#x91CC;&#x9762;&#x4F60;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x4EFB;&#x4F55;&#x65B9;&#x6CD5;&#x54CD;&#x5E94; action&#x3002; <code><span class="token keyword">switch</span></code> &#x8BED;&#x53E5;&#x662F;&#x6700;&#x5E38;&#x7528;&#x7684;&#x65B9;&#x5F0F;&#xFF0C;&#x5F53;&#x7136;&#x4F60;&#x4E5F;&#x53EF;&#x4EE5;&#x7528; <code><span class="token keyword">if</span></code>&#x3001;&#x529F;&#x80FD;&#x67E5;&#x627E;&#x8868;&#x3001;&#x521B;&#x5EFA;&#x62BD;&#x8C61;&#x51FD;&#x6570;&#x7B49;&#x3002;&#x4E8B;&#x5B9E;&#x4E0A;&#xFF0C;&#x867D;&#x7136; Redux &#x8981;&#x6C42;&#x6BCF;&#x4E2A; action &#x5BF9;&#x8C61;&#x90FD;&#x6709;&#x4E00;&#x4E2A; <code>type</code> &#x7684;&#x5B57;&#x6BB5;&#xFF0C;&#x4F46;&#x662F;&#x4F60;&#x7684; reducer &#x903B;&#x8F91;&#x4E0D;&#x5FC5;&#x4E00;&#x5B9A;&#x8981;&#x4F9D;&#x8D56;&#x5B83;&#x505A;&#x5904;&#x7406;&#x3002;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;&#x6807;&#x51C6;&#x65B9;&#x6CD5;&#x80AF;&#x5B9A;&#x662F;&#x7528;&#x57FA;&#x4E8E; <code>type</code> &#x7684; <code><span class="token keyword">switch</span></code> &#x8BED;&#x53E5;&#x6216;&#x8005;&#x67E5;&#x627E;&#x8868;&#x3002;</p>
<h4 id="%E8%A1%A5%E5%85%85%E8%B5%84%E6%96%99">&#x8865;&#x5145;&#x8D44;&#x6599;</h4>
<p><strong>&#x6587;&#x6863;</strong></p>
<ul>
<li><a href="recipes/ReducingBoilerplate.md">Recipes: Reducing Boilerplate</a></li>
</ul>
<p><strong>&#x8BA8;&#x8BBA;</strong></p>
<ul>
<li><a href="https://github.com/reactjs/redux/issues/883" target="_blank">#883: take away the huge switch block</a></li>
<li><a href="https://github.com/reactjs/redux/issues/1167" target="_blank">#1167: Reducer without switch</a></li>
</ul>

                    
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